nar-maven-plugin lacks support for the ppc64le arch. I'll attach a git formated patch for support here.
Created attachment 876048 [details] ppc64le support
Fixed in nar-maven-plugin-3.0.0-5
I believe that this feature is included in nar-maven-plugin-3.0.0-5, which is available in Fedora Rawhide, so I am closing this bug now. The build which includes the feature can be found at Koji: http://koji.fedoraproject.org/koji/buildinfo?buildID=505782